Now on to the underground "bomb" tank, I already had a large quantity of 10mm Polyurethane/ Nylon tubing so I really wanted to be able to use it up. As I thought one pipe run might be too restrictive due to everything I'm water-cooling I decided to just triple up the flow pipes making three connections for input & output. One for the CPU block, one for VGA GPU, Mobo Chipset, PSU, & one for HDD's, VGA Ram block, and maybe system ram later, all supplied from the same pump. All fittings & pipe are pneumatic rated at 10bar. Here are some construction pics. Just tapped some washer spacers with 1/4 " BSP thread, welded them on to the tank where I'd pre-drilled holes, Sealed over all the welds with JB weld, painted the tank with black tar paint & then the pneumatic fittings were screwed in with Araldite on the threads to ensure leak proof seal, hopefully it will remain leak proof for a good while.

Fig. 36 The Bomb

Fig. 37 Threading tank fittings

Fig. 38 Tank fittings welded on

Fig. 39 Tank inlets

Fig. 40 Tank outlets

Fig. 41 Finished tank

I had this “bomb” at the end of my drive all day just for fun and it was getting some very weird looks, but the bomb squad never turned up fortunately!

Next part was even more fun… Digging the hole!

I have an ace up my sleeve here though as I’m building a house. Enter a tatty 1972 JCB

Fig. 42 Starting to dig

Fig. 43 The abyss

Fig. 44 JCB arm fully extended

Fig. 45 JCB in action

It's hard to gauge hole depth from those 2D pics, but you can see it was full JCB arm depth. It is about 8½ feet deep. Once the tank was seated in the hole, (tank is 4 foot high), if I stood on the top of it my head would just stick out the top. I'm about 5'8"